1. Department of Oral and Maxillofacial Surgery, The Sixth Affiliated Hospital of Sun Yat‑sen University, Guangzhou, Guangdong 510655, P.R. China
2. Department of Oral and Maxillofacial Surgery, The Sixth Affiliated Hospital of Sun Yat‑sen University, Guangzhou, Guangdong 510655, P.R. China
3. Department of Stomatology, Sun Yat‑sen Memorial Hospital of Sun Yat‑sen University, Guangzhou, Guangdong 510120, P.R. China
4. Department of Oral and Cranio‑maxillofacial Surgery, Ninth People's Hospital, Shanghai Jiao Tong University, School of Medicine, National Clinical Research Center for Oral Diseases, Shanghai 200001, P.R. China
5. Department of Oral and Maxillofacial Surgery, University of Michigan, Ann Arbor, MI 48109, USA